CVE-2026-56164

critical

Description

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

From the Tenable Blog

July 2026 Patch Tuesday: Largest Patch Tuesday 569 CVEs

Published: 2026-07-14

Microsoft patched 569 CVEs in July 2026, the largest Patch Tuesday release in its history. 56 critical CVEs patched including three zero-day vulnerabilities.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164

https://www.securityweek.com/cisa-urges-immediate-patching-of-exploited-sharepoint-vulnerabilities/

https://www.bleepingcomputer.com/news/security/cisa-warns-admins-to-patch-actively-exploited-sharepoint-flaws/

https://therecord.media/microsoft-vulnerabilities-patch-tuesday-release

https://thehackernews.com/2026/07/researcher-drops-new-windows-zero-day.html

https://securityaffairs.com/195383/security/u-s-cisa-adds-sonicwall-and-microsoft-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.theregister.com/security/2026/07/14/patchpocalypse-now-microsoft-tops-last-months-record-with-622-patch-tuesday-cves/5271434

https://www.securityweek.com/microsoft-patches-record-622-vulnerabilities-including-two-exploited-zero-days/

https://www.darkreading.com/vulnerabilities-threats/records-broken-patch-tuesday-raises-triage-stakes

https://www.cisa.gov/news-events/alerts/2026/07/14/cisa-urges-sharepoint-hardening-after-new-exploitations

https://www.cisa.gov/news-events/alerts/2026/07/14/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://thehackernews.com/2026/07/microsoft-patches-record-622-flaws.html

https://securityaffairs.com/195347/security/patch-tuesday-security-updates-for-july-2026-the-largest-update-ever-621-cves-in-one-month.html

https://krebsonsecurity.com/2026/07/microsoft-patches-a-record-570-security-flaws/

https://cyberscoop.com/microsoft-patch-tuesday-july-2026/

https://www.theregister.com/security/2026/07/15/cisa-sounds-alarm-over-trio-of-exploited-sharepoint-flaws/5271814

https://www.tenable.com/blog/microsofts-july-2026-patch-tuesday-addresses-569-cves-cve-2026-56155-cve-2026-56164

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164

Details

Source: Mitre, NVD

Published: 2026-07-14

Updated: 2026-07-14

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics